Method for wiring



March 12, 1968 J. R. VICKERY, JR 3,372,475

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METHOD FOR WIRING Original Filed J1 1ly 9. 1963 l7 Sheets-Sheet 17 0mm 0E 09 om own zoEmom m z 355 T N1 29:3. 8 9% 70x53 United States Patent 3,372,475 METHOD FOR WIRING John Roy Vickery, Jr., York, Pa., assignor to AMP Incorporated, Harrisburg, Pa.

Original application July 9, 1963, Ser. No. 293,602, now Patent No. 3,186,077, dated June 1, 1965. Divided and this application Feb. 2, 1965, Ser. No. 429,734

3 Claims. (Cl. 29628) ABSTRACT OF THE DISCLOSURE Method of making clip-type electrical connections comprises steps of feeding wire from endless source and locating the end of the wire above, and in alignment with, the terminal post. Clip is thereafter moved onto post to make first clip-type connection. Wire is therefore fed from source to the second post and wire is located with its axis extending above the top of the second post and to endless source. Second clip is thereafter moved onto second post so that the wire extends from second connection to the source. Third and subsequent connections can be made in similar manner without severing the wire to provide a continuous conductor between several posts.

This invention relates to a method for forming electrical connections between terminal posts on a wiring panelboard having a multiplicity of such posts mounted thereon. This application is a division of application Ser. No. 293,602, filed July 9, 1963 by John Roy Vickery, Jr., for Method and Apparatus for Wiring Panel Boards, now Patent No. 3,186,077.

The co-pending application of Robert F. Cobaugh, Ser. No. 171,074, filed Feb. 5, 1962, for Electrical Connections, now Patent No. 3,239,918, discloses and claims a method and apparatus for making electrical connections between insulated wires and terminal posts by means of open-sided clips which are adapted to embrace the post and hold the wire against its surface. In accordance with one embodiment of this Cobaugh invention, the wire is positioned with its axis extending transversely of the axis of the post and the clip is moved axially past the wire, over a mandrel, and onto the post so that it drags the wire over the surface of the mandrel and the post. The arrangement may be such that the insulation is stripped from the wire while it is dragged across the mandrel so that the clip holds an uninsulated end of the wire against the post while the portion of the wire which extends from the clip remains insulated. The above-mentioned Cobaugh application discloses one type of applicator for making electrical connections which is useable with a conventional work-holding fixture which is relatively movable with respect to a panelboard thereby to permit the wiring of panelboards in a fully automatic and controlled manner.

It is an object of the present invention to provide an improved method for wiring panelboards or the like in accordance with the above-identified Cobaugh application. It is a further object of the inventionto provide an apparatus capable of carrying out the wiring operation at a relatively high speed. A further object is to provide an apparatus having an improved means for feeding wire during movement of the apparatus from a position above a first terminal post with which an electrical connection has been made to a position above a second terminal post with which an electrical connection is to be made. A further object is to provide a wiring machine for automatically wiring panelboards having an improved arrangement for laying the Wire between the rows of terminal posts when the apparatus is moved from a position above a first terminal post to a position above a second terminal post. A further object is to provide an automatic wiring machine in which electrical connections between terminal posts can be made by withdrawing wire from a coil or other substantially endless source, and having an improved means for shearing the wire after an electrical connection has been made to a second terminal post of a pair of posts.

These and other objects of the invention are achieved in a preferred embodiment comprising an applicator having a reciprocable clip pusher and a reciprocable shear blade which are movable relatively towards the terminal post to which a connection is to be made. An individual clip is positioned in alignment with the clip pusher by means of a clip transfer device which is movable from a loading station, at which a single clip is picked up, to a position in alignment with the clip pusher. A mandrel, over which the clip is pushed, is disposed in alignment with the clip pusher and between the transfer device and the upper end of the terminal post. When the leading end of a Wire is to be connected to a first terminal post, the wire is located with its axis extending transversely of the path of movement of the clip pusher and between the transfer device and the mandrel so that upon movement of the pusher towards the post, the clip is pushed relatively past the wire, over the mandrel, and onto the post. During this first operation, the wire will extend from the opposite side of the pusher from the side on which the shearing blade is located and since the leading end of the wire is being connected to the post, no shearing takes place. After the first connecting operation has been carried out, the applicator is moved to a position in alignment with the second terminal post of the pair of posts being connected. The Wire is then oriented with its axis extending between the mandrel and the clip transfer device and thence transversely of the path of reciprocation of the shearing device from which it will extend through the feeding mechanism to the reel supply. Upon movement of the pusher and the shear blade towards the terminal post, the wire is sheared and the cut end is stripped and dragged over the mandrel and onto the post as described above.

A significant feature of the invention is that the wire extending from the reel is led between the pusher and the mandrel from either of two opposite sides; that is the wire extends from the reel across the mandrel and towards the shear blade when the first connection is being made but it extends from the reel across the path of reciprocation of a shear blade and then across the mandrel when the second connection is being made between a pair of posts. Such shifting of the wire is accomplished by means of a Wire nozzle or guide through which the wire is fed and which is shiftable in synchronism with the movements of the clip pusher and shear blade.

The specific details of a preferred embodiment of the invention are described in the specification which follows and are shown in the drawing in which:

FIGURE 1 is a perspective view of a program controlled panel Wiring machine equipped with a wiring 3 applicator or head in accordance with the present invention;

FIGURE 2 is a perspective view of the applicator in accordance with the invention, some of the parts having been broken away and others omitted from this view as described in the specification;

FIGURE 3 is a view similar to FIGURE 2 but showing only the frame work of the applicator, the rotating shafts,

and the stationary rocker arm shafts;

FIGURE 4 is a fragmentary plan view of the back surface of the frame plate 26 showing the single revolution clutch by means of which the applicator is driven through a single operating cycle;

FIGURE 5 is a plan view of the plate 24 and showing the wire feed nozzle and the mechanism for shifting the end of the wire from one side of a terminal post to an intermediate position and to the opposite side of the post, the parts being shown in the positions they occupy when the wire is being connected to the first one of two terminal posts;

FIGURE 6 is a view similar to FIGURE 5 but showing the positions of the parts when the wire feed nozzle is in its intermediate position which it occupies during movement of the applicator from a first terminal post to a second terminal post;

FIGURES 7 and 8 are views taken along the lines 77 and 8-8 respectively of FIGURE 6;

FIGURE 9 is a view similar to FIGURE 5 but showing the positions of the parts when the wire is being attached to the second terminal post of a pair of posts being connected;

FIGURE 10 is a view taken along the lines 1010 of FIGURE 9;

FIGURE 11 is a diagrammatic plan view showing a portion of a terminal board and illustrating the movements of the wire nozzle during a complete operating operation;

FIGURE 12 is a fragmentary perspective view showing the clip pusher, by means of which the clip is pushed onto the terminal post, and the associated guiding and actuating mechanism for the pusher;

FIGURE 13 is a view taken along the lines 13-13 of FIGURE 12;

FIGURE 14 is a fragmentary perspective view showing the wire shear blade and the guiding and actuating mechanism associated therewith;

FIGURE 15 is a fragmentary perspective view showing both the clip pusher and the shear blade;

FIGURE 16 is a view taken along the lines 16-16 of FIGURE 15;

FIGURE 17 is a fragmentary sectional side view showing the clip feeding, guiding, and shearing mechanism and illustrating the manner in which the leading clip of the strip is fed onto the transfer device;

FIGURE 18 is a view taken along the lines 1818 of FIGURE 17;

FIGURE 19 is a view similar to FIGURE 17 but showing the positions of the parts when the leading clip is sheared from the strip of clips;

FIGURE 20 is a perspective fragmentary view showing the clip transfer mechanism and illustrating the positions of the parts after a single clip has been positioned. in alignment with the clip pusher;

FIGURE 21 is a view taken along the lines 2121 of FIGURE 20;

FIGURE 22 is a view similar to 21 but showing the positions of the parts when the transfer device is in alignment with the feed path of the strip of clips and is disposed at the clip loading station;

FIGURE 23 is a view taken along the lines 23-23 of FIGURE 22;

FIGURE 24 is a view similar to FIGURE 23 illustrating the severing of the leading clip from the strip;

FIGURE 25 is a fragmentary perspective view of the clip mandrel and mandrel bar;

FIGURE 26 is a fragmentary sectional view on an enlarged scale showing the positions of the wire nozzle, the mandrel, the transfer device, the clip shearing blade, and the clip pusher at the beginning of the operation of connecting the wire to the first of two terminal posts;

FIGURE 27 is a view similar to FIGURE 26 but showing the positions of the parts during the interval of movement of the applicator from the first post to which the connection is to be made to the second post;

FIGURE 28 is a view similar to FIGURE 26 but showing the positions of the parts at the beginning of the operation of connecting the wire to the second of two terminal posts;

FIGURE 29 is a view similar to FIGURE 28 but showing the positions of the parts at the end of the connecting operation;

FIGURE 30 is a perspective view of a short section of connector clips;

FIGURE 31 is a perspective view of a terminal post having a wire connected thereto by a connector clip;

FIGURE 32 is a plan view of the rearward side of the frame plate 24 and showing the chain drive for the power shafts; and

FIGURES 33 and 34 are intended to be placed beside each other and show a timing diagram for the applicator.

Referring first to FIGURES 30 and 31, in accordance with the above-identified Cobaugh application an electrical connection between a terminal post 11 and a wire 13 is achieved by means of a clip 1 having a web 3 with upstanding sidewalls 5 on two opposite sides thereof. The sidewalls are reversely curled along their longitudinal edges 7 so that the clip is adapted to embrace the post and to hold the stripped end 15 of the wire against the surface of the post with the wire extending relatively downwardly along the post and emerging from the clip at its lower end as viewed in the drawing. Advantageously, an outwardly cupped insulation support 9 is provided on the web at its leading end for the accommodation of the end portion of the insulation of the wire.

The wiring machine in accordance with the invention, FIGURE 1, comprises an applicator or head 2 having a mounting bracket 4 secured thereto which is suspended by means of a rod 6- from a bracket 8. The bracket 8 extends from a coordinately movable carriage 10, the motion of the carriage being accomplished by a pair of rotatable screws, one of which is shown at 12. A panelboard 16, from which the terminal posts 11 project, is supported on a stationary table 14 which, in turn, is supported by a base 18. Wire 13 and terminal clips in strip form 1 are supplied to the applicator head 2 from reels which may be conveniently mounted on a carriage 10. In the disclosed embodiment, a pair of stabilizing plates 19 extend from the carriage and are secured to the applicator head to prevent lateral movement thereof and to assure precise positioning of the head with respect to the board 16.

The apparatus shown is capable of electrically connecting any two of the terminal posts 11 on the board 16. In general, the electrical connection between two posts is formed by first connecting the end of the wire 13 to the first post (herein designated as the A post), moving the applicator 2 to a position above the second or B post by means of the power screws, severing the wire 13, and connecting the end to the B post.

Advantageously, the operation is carried out by means of a controller 20 which, under the influence of a source of intelligence in the form of a punched tape 21, directs the complete wiring operation of the panelboard 16. A conventional manual control console 22 is provided to permit manual operation of the apparatus when desired for experimentation or adjustment.

The principles of the present invention can be grasped from a brief reference to FIGURES 26-29 and are described at this juncture to provide a background for the detailed description of the applicator 2. Referring first to FIGURE 26. when the end of the wire 13 is to be connected to the first one of a pair of terminal posts (the A post), the wire is positioned as shown in FIGURE 26 in which its end portion is emergent from a shiftable nozzle or guide 102. This end portion of the wire is disposed in FIGURE 26 with its axis extending between a mandrel 460 and a clip transfer device 336. With the parts in these positions, the axis of the wire will extend transversely of the web of a clip 1 on the transfer device and transversely of the A post. Upon downward movement of a clip pusher 200, the clip is pushed from the transfer device past the wire, over the mandrel, and onto the terminal post. As the clip moves past the wire, the leading edge of the clip forces the wire against the upper side of the mandrel, the edges of which cut into the insulation. Subsequently, and as the clip moves over the mandrel, the clip pulls the end portion of the metallic core of the wire from the end section of insulation and through a sloping groove 404 in the mandrel. When the clip comes to rest upon the A post the stripped end of the wire will be clamped against the surface of the post.

While the applicator is being moved from the A post to the B post, the nozzle 102 occupies the position of FIGURE 27 in which its axis extends substantially vertically. Wire is fed through the nozzle during such movement of the applicator thereby to provide the necessary length of wire to extend between the two posts. After arrival of the applicator at the B post the nozzle is shifted from the position of FIGURE 27 to the position of FIGURE 28 in which it is on the opposite side of the mandrel from the side over which the clip is moved. It will also be noted in FIGURE 28 that the nozzle has been moved slightly beyond a shear blade 256 which is in alignment with the clip pusher 206' and which is movable with the clip pusher. Upon downward movement of the clip pusher 200 and the shear blade 256 to the position of FIGURE 29, the wire is severed by the shear blade while the clip moves downwardly onto the B post to make an electrical connection between the wire and the B post. After upward movement of the shear blade and the pusher from the position of FIGURE 29, the nozzle is moved back to the position of FIGURE 26 while the applicator is moved to the next post (the A post) of the next pair of posts which are to be connected. A detailed description of the mechanisms for carrying out the steps shown in FIGURES 26-29 will now be described.

Referring to FIGURES 2 and 3, the frame of the applicator head mechanism comprises three substantially parallel plates 24, 26, and 28. Plates 24 and 26 are secured in spaced apart relationship to each other by suitable fasteners and spacers as shown. The H-shaped smaller frontal plate 28 is supported by means of brackets 23a, 23b, 23c, and 23d extending from the plate 26, a vertical brace 25 being provided between the brackets 23b and 23c.

The cams which actuate the various mechanisms of the applicator are mounted on two parallel shafts 30 and 32. The shaft 30 extends through the plates 24, 26 and between the plates 26, 28 while the shaft 32 extends only to the plate 26. As shown in FIGURE 32, the shaft 30 has a sprocket 54 on its rearward end and the shaft 3-2 has a sprocket 56 on its rearward end. A chain 52 passes over the sprockets 54, 56 and over an idler sprocket 58 so that the two shafts rotate together during operation. Power is supplied to the applicator from the output shaft 48 of a motor having a sprocket on its end. This sprocket is coupled by means of a chain 49 to a sprocket 51 on the shaft 30. As indicated by the relative sizes of the sprockets 54, 56, the shaft 30* makes two complete revolutions for each single revolution of the shaft 32. The complete operating cycle of the apparatus during which an electrical connection is made to an A post and a B post requires two revolutions of the shaft 30 and a single revolution of the shaft 32.

Referring now to FIGURE 4, a single revolution clutch on the shaft 30 comprises a pair of concentric sleeves 31, 33. A rotatable key 36 in the sleeve 33 is adapted to be rotated about its axis until it is received within a groove in the sleeve 31 thereby to engage the clutch. A spring 41 on the sleeve 31 biases a pin 39 which is integral with the key 36 in the manner such that the clutch is normally in engagement. A lever 38 pivoted at 40 to the plate 26 adjacent to the shaft 30 is normally biased by a spring 42 in a clockwise direction as viewed in FIGURE 4 towards the shaft so that its lower end engages the pin 39 and maintains the clutch in disengagement condition (as shown in the drawing) against the normal biasing force of the spring 41. When it is desired to engage the clutch for a single revolution of the shaft 30, a signal from the tape is supplied to a solenoid 46 driving the plunger 44 thereof leftwardly in FIGURE 4. This plunger is pivotally connected to the lever 38 and upon leftward movement of the plunger the lever is swung in a counterclockwise direction so that its lower end moves out of engagement with the pin 39. The spring 41 then causes the clutch to be engaged whereby the shaft 30 is driven through a single revolution and until the pin 39 again encounters the lower end of the lever 38. The signal supplied to the solenoid 46 is instantaneous so that immediately after engagement of the clutch and commencement of the single revolution of the shaft, the lever returns to its normal position and causes the clutch to be disengaged at the completion of the single revolution. As described below, the cams which actuate the mechanisms for forming an electrical connection with a terminal post (either the A or B post) are mounted on a shaft 30 so that this shaft must rotate two revolutions whenever a complete connection is made between two posts since each end of the wire is connected to one of the posts. The shaft 32 is rotated only one-half of a revolution during each complete revolution of the shaft 30 since the cams on this shaft actuate the mechanisms which operate only once during a complete cycle.

The wire is fed from the reel 60 by means of a pair of feed rolls 62, 64 (FIGURE 2) through a guide tube 63 and through a flexible tube 67 which is disposed against the front surface of the plate 26. Roll 62 which is fixed with respect to the frame is contained in a housing 66 which, in turn, extends through an opening 68 in the plate 26. A flange 70 on the housing 66 (FIGURE 4) extends beyond the edges of the opening 68 on the rearward side of plate 26 and is secured to the plate by means of a fastener 72 and pins 74. Roll 62 is mounted on a shaft 76 for rotation therewith which shaft extends rearwardly of the plate 26 and has a gear 78 on its end in engagement with a gear 79 on the end of the output shaft of a motor 80. Adjacent to the gear 78, a gear 82 is provided on shaft 76 which meshes with a gear 84 on a shaft 65 on which the feed roll 64 is mounted. Advantageously, the gears 82, 84 have relatively large pitched teeth thereby to permit slight relative movement of the shaft 6-5 towards and away from the shaft 76 without complete disengagement of the gears.

Shaft 65 is rotatably supported in, and extends through, the upper end of a lever 86 pivoted at 90 to the rearward face of the plate 26. This lever extends downwardly past the shaft 30 and has a cam follower 92 mounted on an eccentric pin 94 at its lower end. Cam follower 92 engages a circular cam 96 mounted on the sleeve 31 for rotation therewith, the cam 96 having a notch on its periphery which is substantially diametrically opposite to the pin 39. Lover 86 is normally biased in a counterclockwise direction as viewed in FIGURE 4 by means of a spring 100 having one end secured to a pin in the plate 26 and having its other end secured to a pin in the lever as shown in FIGURE 2. The spring 100 thus normally biases the movable roll 64 against the surface of the roll 62 in which position wire is fed by the rolls through the guide tube 67, however, during periods of rotation of the shaft 30, that is when the clutch is engaged and the cam 96 is rotating, this cam will swing the lever in a 

